ARP 100-1411 12-Point 3/8' x 1.500 OAL Header Stud Kit - 16 Piece: Automotive. Buy ARP 100-1411 12-Point 3/8" x 1.500 OAL Header Stud Kit - 16 Piece: Header Bolts - ✓ FREE DELIVERY possible on eligible purchases. ARP Header Stud/Bolt Kit . Universal Stud kit, pack, 3/8"-5/" Size.500" Over All Length, 2-point head, Black Oxide, Header Studs 00-4. Header Bolts & Header Studs that are Universal. manufactures a variety of premium grade bolt and stud kits to facilitate installation of exhaust headers including the popular stainless stud kit with 2-point nuts. Header Bolts & Header Studs that are Stainless 300 material are not affected by corrosion or extreme heat, making it ideal for the application. What’s more, the compact 2-point nut lets you easily slip a socket close to the pipe!Each accessory stud or bolt kit includes the specific number of parts for your application, plus premium-quality washers and hex or 2-point nuts, as required. Studs are manufactured with a unique nut-starter nose that helps prevent cross-threading.. Header Bolts & Header Studs come either black oxide chrome moly or Stainless 300. Both are nominally rated at 70,000 psi tensile strength; substantially stronger than Grade 8 hardware. Specially drilled “NASCAR” models are available for those who wish to safety wire their header bolts to Special “NASCAR” model prevent loosening..Studs are measured OAL (Over All Length) and Bolts are measured UHL (Under Head Length) . . . .